[postgis-users] Create new lines from GPS points

[Ralf Suhr]

Hi Martin.

ST_Line_Substring(road, ST_Line_Locate_Point(road, gps_start), 
ST_Line_Locate_Point(road, gps_end)) AS highlight

Gr
Ralf

Am Dienstag 11 Januar 2011, 17:46:06 schrieb Martin Fafard:
> Ralf
> 
> Yes, ok for the buffer. But how to "dynamically segment" my new road
> from my original segment?
> 
> Martin
> 
> Ralf Suhr a écrit :
> > Hi Martin,
> > 
> > you will not get a correct solution for this problem. Your road network
> > and the gps points differs always.
> > 
> > A possible "solution" is building a buffer around the streets und look
> > für intersection with gps points and filter by direction road/points.
> > Grouping gps points can give you the start and end point for the road.
> > If a road is only one times driven.
> > 
> > Gr
> > Ralf
> > 
> > Am Dienstag 11 Januar 2011, 17:16:18 schrieb Martin Fafard:
> >> Hi
> >> 
> >> I have a network of roads (topological) and I receive GPS points. I
> >> would like to create new lines who follow exactly the same path as my
> >> road from the GPS points (to "highlight" where the GPS unit was on the
> >> network). The problem is I need to segment the new line because the GPS
> >> points can stop anywhere on my roads... Any advice to do this?
> >> Thank you
> >> 
> >> Martin F
> >> _______________________________________________
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> >> postgis-users at postgis.refractions.net
> >> http://postgis.refractions.net/mailman/listinfo/postgis-users

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